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Sum Average Aggregate Functions
The following example shows using HQL sum, avg and count aggregate functions.
Refer first example for the configuration and mapping.
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package com.bethecoder.tutorials.hibernate.basic.tests;
import java.util.Arrays;
import org.hibernate.Session;
import com.bethecoder.tutorials.hibernate.basic.util.HibernateUtil;
public class HQLSumAvgCountTest {
/**
* @param args
*/
public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
String HQL_QUERY = "select sum(employeeCount), avg(employeeCount), count(*) from Company comp";
Object[] row = (Object[]) session.createQuery(HQL_QUERY).uniqueResult();
System.out.println(Arrays.toString(row));
System.out.println("Total employee count : " + row[0]);
System.out.println("Average Employee count : " + row[1]);
System.out.println("Company count : " + row[2]);
session.getTransaction().commit();
session.close();
}
}
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It gives the following output,
[402944, 40294.4, 10]
Total employee count : 402944
Average Employee count : 40294.4
Company count : 10
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